Airthrey Castle is a historic building and estate which now forms part of the buildings and grounds of the University of Stirling in central Scotland. It first appears in documents around 1370 and passed through different hands before becoming part of the graham estate and then afterwards to Earl of Hope of Hopetoun House fame.
The present structure was designed by the architect Robert Adam in 1791 although the house and estate were sold soon afterwards to the Abercrombies where it remained until rebought by the Grahams again in 1891. In the twentieth century it was used as a maternity hospital until becoming the heart of the new University of Stirling in 1969.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.